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Manual Reference Pages  - INITGROUPS (3)

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initgroups - initialize the supplementary group access list

CONTENTS

Synopsis
Description
Errors
Files
Notes

#include <sys/types.h> 

#include <grp.h> 



int initgroups(const char *user, gid_t group); 

The initgroups() function initializes the group access list by reading the group database /etc/group and using all groups of which user is a member. The additional group group is also added to the list.

The initgroups() function returns 0 on success, or -1 if an error occurs.

EPERM	The calling process does not have sufficient privileges.
ENOMEM	Insufficient memory to allocate group information structure.

/etc/group              group database file

SVID 3, BSD 4.3

The prototype for initgroups is only available if _BSD_SOURCE is defined (either explicitly, or implicitly, by not defining _POSIX_SOURCE or compiling with the -ansi flag).

getgroups(2), setgroups(2)

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